JP3154933U - Stacking lens module positioning lens holder - Google Patents

Abstract

A stack lens module such as a camera for a mobile phone terminal that increases the possibility of mass production is provided. An annular projection serving as a first positioning mechanism 202 is provided on the outer peripheral surface of a stack lens submodule 20 constituting the stack lens module 1, and the projection is fitted into the lumen of an injection mold. A stack lens module including the positioning lens holder 10 is formed by providing a second positioning mechanism and placing the stack lens sub-module 20 in the mold as a fitting part. [Selection] Figure 3

Description

  The present invention relates to a positioning lens holder of a stacked lens module, and in particular, a lens module having a positioning lens holder by an injection molding or press molding method in which a stacked lens submodule is used as a fitting part and the fitting part is embedded. The present invention relates to a positioning lens holder for a stack lens module which is molded and suitable for use as a camera lens, a small lens, and a camera lens for a mobile phone terminal.

  An optical lens is the smallest optical part of a camera or a mobile phone terminal lens with a camera, and is composed of one or more optical lenses when used. As shown in FIG. 1, the optical lens 20a is generally manufactured from an optical plastic or optical glass material. It comprises an optical surface 21a and an outer shoulder 22a, and the optical surface 21a with the optical working surface is generally a circular surface, an outer shoulder that is a non-optical working surface surrounding the outer periphery of the optical surface 21a. ) 22a is circular or square. In general, the lens 20a is fixed in a lens module, but is first positioned and fixed to a holding ring 10a to constitute an optical lens set 1a. The holding ring is made of a metal or plastic material, so that the lens 20a has the center axis (optical axis) of the lens coincident. Furthermore, the holding ring 10a (lens set 1a) can be slid in the lens module by an actuator to achieve the purpose of focus adjustment (US7,312,933, US7,095,572, US2007 / 0024989 and JP3650594). Etc.).

A known fixing method between the lens 20a made of plastic or glass and the holding ring 10a is shown in FIG. In particular, in the optical glass lens, first, a holding ring 10a corresponding to the shape (circular or square shape) of the outer shoulder 22a of the lens 20a is formed. However, the outer shape of the holding ring 10a is not necessarily limited to a circle or a rectangle. Further, the lens 20a is placed in a predetermined concave groove of the holding ring 10a, positioned, and fixed with an adhesive. The adhesive is usually a UV curing agent, and generally needs to undergo a curing process such as UV irradiation curing by a UV curing apparatus.
Since the lens 20a is very small, when it is positioned and fixed by an automatic operation machine or automatic adhesive application, the optical surface 21a is often scratched or the adhesive adheres (that is, the adhesive overflows). This wastes time in the manufacturing process and increases the defective product rate.
In particular, when positioning and fixing with respect to the glass lens 20a and the plastic holding ring 10a, the operation of the UV curing agent is more difficult, the defective product rate is high, and the UV curing process takes time, hindering cost reduction. (See JP3791615, JP06258562 and US7224542, US2007 / 0047109).

A technique for performing injection molding by first inserting a fitting part into a mold hole is called an insert injection molding method. This is because a fitting part (generally a metal part) is first put in a mold hole of a predetermined mold, and then a molten plastic (rubber) material is filled in a predetermined molding area (that is, a pouring area) in the mold hole. A part or the whole of the fitting part is covered, cooled and cured, and the product is taken out from the mold.
This manufacturing method has already been used extensively for electronic parts, connectors, mechanical parts, and LEDs (see US5,923,805, TWM313317, JP07120610, etc.). With this manufacturing method, when manufacturing an outer cap with a plastic lens, the outer cap (housing) is used as a fitting part, first put in a mold hole, and a plastic lens is injection-molded with a plastic material. Alternatively, a plastic lens is used as a fitting part, and an outer cap is injection-molded with a plastic material and integrally joined to manufacture an integrally molded outer cap having a plastic lens (see TW 0528279, US Pat. No. 6,825,503). Alternatively, a glass plate is used as a fitting part, and the periphery of the glass plate is covered with a plastic material to form lenses for various uses such as window glass (JP622511113, etc.). Alternatively, as in US 6,710,945, the lens and the lens barrel are injection-molded several times by two plastic material injection holes. Alternatively, an infrared glass piece is used as a fitting part, and a mount is injection molded to cover it.

Alternatively, as in US7,332,110, etc., the spectacle frame is used as a fitting part, first put into the mold hole of the mold, and the plastic lens preform is heated and softened by the press molding method to mold The mold hole shape is transferred onto the softened preform by heating and pressurizing. In this way, the preform is molded into a lens, and at the same time, integrally formed with the spectacle frame to form spectacles.
However, this press molding method cannot be applied to the manufacturing process of the glass lens and plastic holding ring integrated joint. This is because if the plastic holding ring is used as the fitting part, the softening temperature of the optical glass is about 500 ° C., which is much higher than the deformation temperature of the plastic material of the plastic holding ring, 80 ° C. When the mold reaches the softening temperature of the optical glass, the plastic holding ring is already deformed and cannot be molded. Therefore, although the press molding method can be used for mass production, since the plastic holding ring is used as the fitting part and the glass material is used as the material for the press molding, it is difficult to realize technically.

  In manufacturing lens modules, for example, US 2009/0059398, proposes placing an optical lens, positioning member, sensor member, etc. in a mold and injecting a plastic material to form a lens module. Further, as shown in FIG. 2, the TWM337077 has two optical glass lenses 20b, two light shielding ring pieces 30b, and spacers 40b as fitting members placed in order in the molds 31b and 32b, and is plastic injection molded or cast press. It is proposed that a lens holder is formed by a molding method and the fitting member is wrapped to form a lens module. However, this technique cannot use a combined lens submodule whose combination has already been completed. This is because they are perfectly combined as a unitary structure and cannot be separated into a single piece and placed in a mold respectively. In addition, since it is difficult to align the centers of the optical lenses, for example, the lenses 20b, 30b, and 40b, it is necessary to spend considerable work on the calibration of the central axis, resulting in a decrease in production volume and low accuracy. Has the disadvantages.

  Due to the demand for high precision lenses, the lens holders are also required to have high precision. However, the positioning accuracy of the combined lens sub-module and lens holder affects the image formation of the lens. It affects the resolution of lens imaging. Accordingly, there is an urgent need to develop new technology, simplify the manufacturing process, and mass-produce lens modules with good positioning accuracy.

JP-A-6-258562 Japanese Patent No. 3650594

  The problem to be solved by the present invention is to provide a positioning lens holder for a stack lens module.

In order to solve the above problems, the present invention provides a positioning lens holder for a stack lens module described below.
The positioning lens holder of the stack lens module is first placed in the cavity of the molding die with the stack lens sub-module as a fitting part.
By injection molding or press molding method in which the fitting part is embedded,
A stack lens sub-module and positioning lens holder are provided, and an integral lens module is molded,
Used for LED light source combination lens, solar conversion system combination lens, camera and mobile phone terminal camera optical lens, etc.
The submodule is formed by stacking at least one optical lens and an optical component, and combining and fixing with an adhesive.
The optical component may be one of an optical lens, a spacer, an aperture, a cover glass, an IR-cut glass, an image sensor, or a combination thereof. Consists of.
The adhesive is a heat fixing type or an ultraviolet solidifying type,
The features of the inventive positioning lens holder are:
On the sub-module, one or several first positioning mechanisms are installed, which are concentric with the optical center, with alignment bumps or alignment grooves,
The second positioning mechanism installed on the molding die is coupled and positioned corresponding to the sub-module so that the optical central axis of the sub-module and the central axis of the positioning lens holder after molding are correctly Correspondingly,
The second positioning mechanism is opposed to the first positioning mechanism, and is a positioning groove or positioning ridge.
The method of injection molding of the positioning lens holder of the present invention consists of the following steps:
S1: Prepare a stack lens sub-module, on which at least one first positioning mechanism (positioning ridge or positioning groove, etc.) is installed, and aiming at the optical center of the sub-module Together
S2: Prepare lens holder injection molds (including upper and lower molds), and install at least one second positioning mechanism (such as positioning grooves or positioning ridges) on the lower mold. And its relative position corresponds correctly to the optical center,
S3: Put the sub-module in the upper and lower molds, and connect with the second positioning mechanism of the lower mold by the first positioning mechanism, and fix and fix correctly.
S4: Heat the plastic material to the expected temperature, inject it from the sprue of the molding die, mold the positioning lens holder with the positioning mechanism,
S5: After the plastic material is cooled and solidified and shaped, the mold is opened, and the stack lens module having the first positioning mechanism is taken out.
The lens holder of the present invention can also be manufactured by the press molding method, which goes through SS1-SS5 steps.
SS1-SS3 and SS5 steps are the same as the corresponding steps of the injection molding method described above, but the SS4 step and S4 step are different,
The differences are as follows:
SS4: Put the plastic material of the planned weight in the planned lens holder molding area composed of the upper and lower molds, heat the molding mold to soften the plastic material up to the planned temperature, and then perform the molding Press the upper and lower molds of the mold, pour the softened plastic material into the upper and lower mold cavities, mold the positioning lens holder with positioning mechanism,
The positioning lens holder of the stack lens module is further provided with a third positioning mechanism such as a positioning tank, which is installed in a molding die (such as an upper die), and a fourth positioning mechanism (alignment pin) such as an alignment pin. The optical center axis of the submodule is positively matched with the center axis of the positioning lens holder after molding, and is not biased.
The manufacturing method includes the following steps.
SSS1: Provide a stack lens sub-module, which installs the first positioning mechanism, aims at the optical center of the sub-module,
SSS2: Prepare a lens holder injection or press mold (including upper and lower molds) and install a second positioning mechanism on the lower mold, and its relative position corresponds to the optical center correctly. The upper mold is provided with a fourth positioning mechanism,
SSS3: The submodule is placed in the upper and lower molds, and is coupled and fixed in a corresponding manner by the second positioning mechanism of the lower mold. The submodule is mounted on the upper mold. The sub-module is tightly pressed by the fourth positioning mechanism to avoid tilting and distortion of the sub-module,
SSS4: Using a method of injection or press molding, put plastic material into the mold cavity, mold the lens holder,
SSS5: After the plastic material is cooled and solidified, the upper mold is opened, the positioning lens holder is provided, and the stack lens module formed integrally with the sub module is taken out. The stack lens module includes the first positioning mechanism and A third positioning mechanism is provided.

The positioning lens holder of the stack lens module of the present invention has the following advantages.
(1) The manufacturing method of the present invention can improve and advance the manufacturing method of the conventional lens module, simplify the manufacturing process, increase the yield, reduce the cost, and further enable mass production of stack lens modules. Can increase the sex.
(2) The stack lens module manufactured according to the present invention can be easily encapsulated in the lens and is ideal for small lenses and mobile phone camera lenses, effectively increasing the possibility of mass production of lenses. Can be increased.

It is a schematic diagram of a prior art. It is a schematic diagram of another prior art. It is side surface sectional drawing at the time of applying this invention 1st Example to the square stack lens module of the lens of a camera. It is a bottom view of the first embodiment of the present invention. It is a top view of the positioning lens holder of the first embodiment of the present invention. It is a bottom view of the positioning lens holder (including a submodule but not including an infrared cut glass) of the first embodiment of the present invention. It is a manufacturing-process figure of the positioning lens holder of 1st Example of this invention. It is a schematic diagram of the upper metal mold | die of the positioning lens holder of 1st Example of this invention. It is a three-dimensional view when the second embodiment of the present invention is applied to a circular stack lens module of a camera lens for a mobile phone terminal. It is a top view of the second embodiment of the present invention. It is side surface sectional drawing in the A-A 'line | wire of FIG. 10 of 2nd Example of this invention. It is side surface sectional drawing in the BB 'line of FIG. 10 of 2nd Example of this invention. It is a side view of the second embodiment of the present invention. It is a schematic diagram of the lower metal mold | die and positioning concave groove of 2nd Example of this invention. It is a schematic diagram which shows the fixed state of the positioning protrusion of the submodule of this invention 2nd Example, and the positioning groove of a lower mold. It is side surface sectional drawing of the circular stack lens module of 3rd Example of this invention.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

(First Example)
As shown in FIGS. 3 to 6, the present embodiment is a positioning lens holder applied to a square stack lens module of a camera lens.
In the rectangular stack lens module 1, the rectangular stack lens sub-module 20 is first inserted into the cavity of the molding die 3 as a fitting part (see FIG. 7).
Next, the lens module 1 which is provided with the rectangular positioning lens holder 10 and is integrally molded with the sub module 20 is molded by injection molding or press molding in which a fitting part is embedded.

The sub-module 20 is formed after stacking at least one rectangular optical lens 21 and necessary optical parts and fixing them together with an adhesive.
The adhesive is a heat fixing type or an ultraviolet solidifying type.

The submodule 20 of the present embodiment includes two optical lenses 21a and 21b and an aperture 22, and further includes an infrared cut glass 24, an image sensor (not shown), and a spacer 23 (see FIGS. 11 and 12).

In the rectangular positioning lens holder 10 of the present embodiment, the second optical lens 21b of the submodule 20 includes a first positioning mechanism 202 whose optical center is concentric with the lens.
The first positioning mechanism 202 is an annular positioning ridge 202.

When the second optical lens 21b is manufactured, a concentric annular groove that is concentric with the lens optical surface (the center of the circle is located on the optical center) is placed on the lens molding die.
Thereby, the second optical lens 21b and the first positioning mechanism 202 complete the integral molding.

The positioning projection 202 and the second positioning mechanism 36 of the molding die 3 are coupled to each other, whereby the submodule 20 is positioned, and the optical central axis of the submodule 20 and the positioning lens holder 10 after molding The center axis of corresponds correctly.
The second positioning mechanism 36 of the molding die 3 is a positioning groove 36 and corresponds to the first positioning mechanism (positioning ridge) 202.

As shown in FIG. 7, the method of injection molding of the rectangular positioning lens holder 20 of the present embodiment includes the following steps.
S1: The square stack lens submodule 20 is prepared as a fitting part.
The square stack lens sub-module 20 is formed after stacking at least one optical lens and an optical component and fixing them together with an adhesive.

As shown in FIG. 3, the sub-module 20 of this embodiment includes an aperture 22 and first and second optical lenses 21a and 21b, and when combined, the optical center axes have already been correctly associated and positioned.

Positioning ridges 202 are provided on the submodule 20, and the positioning ridges 202 are integrally formed with the second optical lens 21b.
The positioning ridge 202 of this embodiment and the second optical lens 21b have concentric optical center axes.

S2: An injection mold 3 for the rectangular positioning lens holder 10 is prepared. The injection mold 3 includes lower and upper molds 31 and 32, and a second positioning mechanism 36 is provided on the lower mold 31. The second positioning mechanism 36 is a positioning groove 36 in the present embodiment, and is concentric with the optical center.

S3: The submodule 20 is placed in the lower and upper molds 31 and 32, and the first positioning mechanism (positioning concave groove) 36 of the lower mold 31 is used for the first positioning mechanism ( Positioning ridges 202) and positioning the submodule 20.

S4: The plastic material is heated to a predetermined temperature and injected through the sprue 34 of the molding die, and the rectangular positioning lens holder 10 is molded. As a result, the rectangular positioning lens holder 10 and the submodule 20 are joined together. .

S5: After the plastic material is cooled and solidified and fixed, the upper molds 31 and 32 are opened, and the integrally formed rectangular stack lens module 1 having the positioning lens holder 10 is taken out.

The rectangular positioning lens holder 10 of this embodiment can also be manufactured by a press molding method.
The manufacturing method and steps are similar to the manufacturing method by injection molding, but there are the following differences in step S4.
That is, a predetermined weight of the plastic material is placed in a cavity formed by the upper molds 31 and 32, and press molding is performed.

The rectangular positioning lens holder 10 of the present embodiment further includes a third positioning mechanism 12 such as a positioning hole (alignment cavity), whereby a fourth positioning mechanism such as a positioning pin (alignment pin) installed in the upper mold 32. Corresponds to 35.

The fourth positioning mechanism 35 of the upper mold 32 has a plurality of positioning pins having an equal length, which are arranged annularly and symmetrically on the periphery (FIG. 8 shows an embodiment having four positioning pins. Only two positioning pins are shown).

When the upper and lower molds 32 and 31 are put together, the fourth positioning mechanism (four positioning pins) 35 is uniformly positioned and tightly fits on the upper surface 201 of the non-optical working area of the submodule 20. Can be squeezed.
As a result, the optical center axis of the submodule 20 does not deviate in the course of injection or press molding, and reliably corresponds to the center axis of the positioning lens holder 10 after molding.

The fourth positioning mechanism (four positioning pins) 35 can form a third positioning mechanism 12 as four positioning cavities (alignment cavities) on the rectangular positioning lens holder 10 after molding.

The manufacturing method and steps of injection molding of the rectangular positioning lens holder 10 having the positioning mechanism of this embodiment are similar to the manufacturing method of injection molding, but there are differences as follows in step S3.
That is, the fourth positioning mechanism 35 (four positioning pins) of the upper mold 32 is uniformly positioned on the upper surface 201 of the non-optical working area of the rectangular stack lens sub-module 20 and pressed tightly. As a result, the rectangular positioning lens holder 10 integrally molded with the submodule 20 reliably corresponds to the optical center axis.

(Second embodiment)
As shown in FIGS. 9 to 13, this embodiment is a positioning lens holder applied to a circular stack lens module of a lens for a mobile phone terminal camera.
In the circular stack lens module 1 of this embodiment, the circular stack lens sub-module 20 is first placed in a cavity of a molding die as a fitting part, and circular positioning is performed by injection molding or press molding method in which the fitting part is embedded. The lens module 1 including the lens holder 10 and molded integrally with the circular stack lens sub-module 20 is molded.
The submodule 20 of this embodiment includes two circular optical lenses 21a and 21b and a spacer 23.

The feature of the circular positioning lens holder 10 of the circular stack lens module 1 of the present embodiment is that the optical lens 21b of the submodule 20 is configured with a first positioning mechanism 202 such as positioning ridges (see FIG. 11). This is a point that is concentric with the optical center of the optical lens 21b.

As shown in FIG. 14, the lower mold 31 is provided with a second positioning mechanism 36 such as a positioning groove, and the center thereof is concentric with the optical center.
When the submodule 20 is put into the molding die 3 (lower die 31) to be a fitting part, the positioning ridge 202 and the positioning groove 36 are combined and positioned as shown in FIG. To do.
As a result, the submodule 20 is sandwiched in the circular positioning lens holder 10 after injection or press molding to form an integral body and correctly correspond to the central axis thereof.

The method of injection or press molding of the circular positioning lens holder 20 of this embodiment and its steps are all the same as in the first embodiment.
Only the outer shapes of the cavities of the lower and upper molds 31 and 32 included in the molding die 3 are modified to be circular.

Similar to the first embodiment, the circular positioning lens holder 10 of the present embodiment further includes a positioning groove 12, which is formed when the mold is released from the positioning mechanism 35 of the upper mold 32.
The injection molding method and steps are similar to those of the first embodiment.
Further, for convenience or necessity of installation of the stack lens module 1, an external thread yama 13 can be integrally formed on the outer edge of the circular positioning lens holder 10 (see FIG. 13).

(Third embodiment)
As shown in FIG. 16, this embodiment is a positioning lens holder applied to a circular stack lens module of a lens for a mobile phone terminal camera, as in the second embodiment.
In the circular stack lens module 1 of this embodiment, the circular stack lens submodule 20 is used as a fitting component.

The submodule 20 is formed by stacking two circular optical lenses 21a and 21b and necessary optical components and combining and fixing them with an adhesive.
The second optical lens 21b is a new moon type, and its concave surface is on the image side.
For the convenience of manufacturing the second optical lens 21b, the first positioning mechanism 202 installed on the optical lens 21b is an annular V-shaped (cross section) positioning concave groove, and the optical center thereof is concentric.

The lower mold 31 is provided with a second positioning mechanism 36 such as a V-shaped positioning protrusion 36 (not shown), which is concentric with the optical center and corresponds to the positioning groove 202 of the submodule 20.

When the submodule 20 is put into the molding die 3 (lower die 31) to be a fitting part (see FIG. 15), the V-shaped positioning groove (202) of the submodule 20 and the lower die 31 are used. The sub-module 20 is sandwiched in the circular positioning lens holder 10 after injection or press molding, and is integrally formed, and corresponds to the central axis correctly.

  The above-mentioned names and contents of the present invention are only used for the explanation of the technical contents of the present invention, and do not limit the present invention. All equivalent applications based on the spirit of the present invention, conversion, replacement of parts (structure), and increase / decrease in quantity shall be included in the protection scope of the present invention.

The present invention has a novelty that is a requirement for a utility model registration request, has sufficient progress compared to similar products of the past, has high practicality, meets social needs, and has a very high industrial utility value. Big.

1 Stack lens module
10 Positioning lens holder
11 Third positioning mechanism
12 external thread Yama
20 stack lens sub-module
201 Upper surface
202 First positioning mechanism
21, 21a, 21b Optical lens
21 aperture
22 spacer
23 image sensor
3 Mold
31 Lower mold
32 Upper mold
34 Sprue
35 Fourth positioning mechanism
36 Second positioning mechanism

Claims (7)

It is a positioning lens holder for the stack lens module, and is integrally molded by injection molding or press molding in an injection molding or press molding mold, with the stack lens sub-module as a fitting part,
The stack lens sub-module is formed by stacking at least one optical lens and at least one optical component and combining and fixing with an adhesive,
The stack lens submodule is provided with a member constituting a first positioning mechanism concentric with at least one optical center,
The molding die is provided with a member serving as a second positioning mechanism having a shape corresponding to the first positioning mechanism, and the stack lens in the positioning lens holder integrally molded by these positioning mechanisms. The positioning lens holder of the stack lens module, wherein the sub-module is correctly associated with the optical center of the positioning lens holder. The molding die is provided with a fourth positioning mechanism made of a member that presses and fixes the stack lens submodule disposed in the mold, and the fourth positioning mechanism causes the stack lens submodule to have an optical center. The positioning lens holder that corresponds correctly and is integrally formed with the stack lens submodule is formed with a member that becomes a third positioning mechanism corresponding to the positioning lens holder after being released from the molding die. The positioning lens holder of the stack lens module according to claim 1. The optical component of the stack lens sub-module includes one or a combination of an optical lens, a spacer, an aperture, a cover glass, an infrared cut glass, and an image sensor. Stacking lens module positioning lens holder. The mold is composed of an upper mold and a lower mold.
2. The positioning lens holder for a stack lens module according to claim 1, wherein each of the second positioning mechanisms is installed in either the upper mold or the lower mold. Each of the first positioning mechanisms is a positioning ridge concentric with the optical center,
2. The positioning lens holder of the stack lens module according to claim 1, wherein each of the second positioning mechanisms is a positioning concave groove that is concentric with the optical center and is coupled correspondingly with the first positioning mechanism. . Each first positioning mechanism is a positioning groove concentric with the optical center,
2. The positioning lens holder for a stack lens module according to claim 1, wherein each of the second positioning mechanisms is a positioning ridge that is concentric with the optical center and is coupled correspondingly with the first positioning mechanism. The mold is composed of an upper mold and a lower mold.
The positioning lens holder for a stack lens module according to claim 2, wherein each of the fourth positioning mechanisms is installed on either the upper mold or the lower mold.

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